This patch introduces userclock sysfs interfaces for AFU, user
could use these interfaces for clock setting to AFU.
Please note that, this is only working for port header feature
with revision 0, for later revisions, userclock setting is moved
to a separated private feature, so one revision sysfs interface
is exposed to userspace application for this purpose too.
Signed-off-by: Ananda Ravuri <ananda.ravuri@xxxxxxxxx>
Signed-off-by: Russ Weight <russell.h.weight@xxxxxxxxx>
Signed-off-by: Xu Yilun <yilun.xu@xxxxxxxxx>
Signed-off-by: Wu Hao <hao.wu@xxxxxxxxx>
Acked-by: Alan Tull <atull@xxxxxxxxxx>
Signed-off-by: Moritz Fischer <mdf@xxxxxxxxxx>
---
v2: rebased, and switched to use device_add/remove_groups for sysfs
v3: update kernel version and date in sysfs doc
---
Documentation/ABI/testing/sysfs-platform-dfl-port | 35 +++++++
drivers/fpga/dfl-afu-main.c | 114 +++++++++++++++++++++-
drivers/fpga/dfl.h | 4 +
3 files changed, 152 insertions(+), 1 deletion(-)
diff --git a/Documentation/ABI/testing/sysfs-platform-dfl-port b/Documentation/ABI/testing/sysfs-platform-dfl-port
index 5961fb2..f641807 100644
--- a/Documentation/ABI/testing/sysfs-platform-dfl-port
+++ b/Documentation/ABI/testing/sysfs-platform-dfl-port
@@ -44,3 +44,38 @@ Contact: Wu Hao <hao.wu@xxxxxxxxx>
Description: Read-write. Read and set AFU latency tolerance reporting value.
Set ltr to 1 if the AFU can tolerate latency >= 40us or set it
to 0 if it is latency sensitive.
+
+What: /sys/bus/platform/devices/dfl-port.0/revision
+Date: July 2019
+KernelVersion: 5.4
+Contact: Wu Hao <hao.wu@xxxxxxxxx>
+Description: Read-only. Read this file to get the revision of port header
+ feature.
+
+What: /sys/bus/platform/devices/dfl-port.0/userclk_freqcmd
+Date: July 2019
+KernelVersion: 5.4
+Contact: Wu Hao <hao.wu@xxxxxxxxx>
+Description: Write-only. User writes command to this interface to set
+ userclock to AFU.
+
+What: /sys/bus/platform/devices/dfl-port.0/userclk_freqsts
+Date: July 2019
+KernelVersion: 5.4
+Contact: Wu Hao <hao.wu@xxxxxxxxx>
+Description: Read-only. Read this file to get the status of issued command
+ to userclck_freqcmd.
+
+What: /sys/bus/platform/devices/dfl-port.0/userclk_freqcntrcmd
+Date: July 2019
+KernelVersion: 5.4
+Contact: Wu Hao <hao.wu@xxxxxxxxx>
+Description: Write-only. User writes command to this interface to set
+ userclock counter.
+
+What: /sys/bus/platform/devices/dfl-port.0/userclk_freqcntrsts
+Date: July 2019
+KernelVersion: 5.4
+Contact: Wu Hao <hao.wu@xxxxxxxxx>
+Description: Read-only. Read this file to get the status of issued command
+ to userclck_freqcntrcmd.
diff --git a/drivers/fpga/dfl-afu-main.c b/drivers/fpga/dfl-afu-main.c
index cb3f73e..9025314 100644
--- a/drivers/fpga/dfl-afu-main.c
+++ b/drivers/fpga/dfl-afu-main.c
@@ -142,6 +142,17 @@ static int port_get_id(struct platform_device *pdev)
static DEVICE_ATTR_RO(id);
static ssize_t
+revision_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ void __iomem *base;
+
+ base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER);
+
+ return sprintf(buf, "%x\n", dfl_feature_revision(base));
+}
+static DEVICE_ATTR_RO(revision);
+
+static ssize_t
ltr_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
@@ -276,6 +287,7 @@ static int port_get_id(struct platform_device *pdev)
static struct attribute *port_hdr_attrs[] = {
&dev_attr_id.attr,
+ &dev_attr_revision.attr,
&dev_attr_ltr.attr,
&dev_attr_ap1_event.attr,
&dev_attr_ap2_event.attr,
@@ -284,14 +296,113 @@ static int port_get_id(struct platform_device *pdev)
};
ATTRIBUTE_GROUPS(port_hdr);
+static ssize_t
+userclk_freqcmd_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
+ u64 userclk_freq_cmd;
+ void __iomem *base;
+
+ if (kstrtou64(buf, 0, &userclk_freq_cmd))
+ return -EINVAL;
+
+ base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER);
+
+ mutex_lock(&pdata->lock);
+ writeq(userclk_freq_cmd, base + PORT_HDR_USRCLK_CMD0);
+ mutex_unlock(&pdata->lock);
+
+ return count;
+}
+static DEVICE_ATTR_WO(userclk_freqcmd);
+
+static ssize_t
+userclk_freqcntrcmd_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
+ u64 userclk_freqcntr_cmd;
+ void __iomem *base;
+
+ if (kstrtou64(buf, 0, &userclk_freqcntr_cmd))
+ return -EINVAL;
+
+ base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER);
+
+ mutex_lock(&pdata->lock);
+ writeq(userclk_freqcntr_cmd, base + PORT_HDR_USRCLK_CMD1);
+ mutex_unlock(&pdata->lock);
+
+ return count;
+}
+static DEVICE_ATTR_WO(userclk_freqcntrcmd);
+
+static ssize_t
+userclk_freqsts_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ u64 userclk_freqsts;
+ void __iomem *base;
+
+ base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER);
+
+ userclk_freqsts = readq(base + PORT_HDR_USRCLK_STS0);
+
+ return sprintf(buf, "0x%llx\n", (unsigned long long)userclk_freqsts);
+}
+static DEVICE_ATTR_RO(userclk_freqsts);
+
+static ssize_t
+userclk_freqcntrsts_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ u64 userclk_freqcntrsts;
+ void __iomem *base;
+
+ base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER);
+
+ userclk_freqcntrsts = readq(base + PORT_HDR_USRCLK_STS1);
+
+ return sprintf(buf, "0x%llx\n",
+ (unsigned long long)userclk_freqcntrsts);
+}
+static DEVICE_ATTR_RO(userclk_freqcntrsts);
+
+static struct attribute *port_hdr_userclk_attrs[] = {
+ &dev_attr_userclk_freqcmd.attr,
+ &dev_attr_userclk_freqcntrcmd.attr,
+ &dev_attr_userclk_freqsts.attr,
+ &dev_attr_userclk_freqcntrsts.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(port_hdr_userclk);
+
static int port_hdr_init(struct platform_device *pdev,
struct dfl_feature *feature)
{
+ int ret;
+
dev_dbg(&pdev->dev, "PORT HDR Init.\n");
port_reset(pdev);
- return device_add_groups(&pdev->dev, port_hdr_groups);
+ ret = device_add_groups(&pdev->dev, port_hdr_groups);
+ if (ret)
+ return ret;
+
+ /*
+ * if revision > 0, the userclock will be moved from port hdr register
+ * region to a separated private feature.
+ */
+ if (dfl_feature_revision(feature->ioaddr) > 0)
+ return 0;
+
+ ret = device_add_groups(&pdev->dev, port_hdr_userclk_groups);
+ if (ret)
+ device_remove_groups(&pdev->dev, port_hdr_groups);
+
+ return ret;
}
static void port_hdr_uinit(struct platform_device *pdev,
@@ -299,6 +410,7 @@ static void port_hdr_uinit(struct platform_device *pdev,
{
dev_dbg(&pdev->dev, "PORT HDR UInit.\n");
+ device_remove_groups(&pdev->dev, port_hdr_userclk_groups);
device_remove_groups(&pdev->dev, port_hdr_groups);
}
diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h
index fe7bca4..77b5137 100644
--- a/drivers/fpga/dfl.h
+++ b/drivers/fpga/dfl.h
@@ -120,6 +120,10 @@
#define PORT_HDR_CAP 0x30
#define PORT_HDR_CTRL 0x38
#define PORT_HDR_STS 0x40
+#define PORT_HDR_USRCLK_CMD0 0x50
+#define PORT_HDR_USRCLK_CMD1 0x58
+#define PORT_HDR_USRCLK_STS0 0x60
+#define PORT_HDR_USRCLK_STS1 0x68
/* Port Capability Register Bitfield */
#define PORT_CAP_PORT_NUM GENMASK_ULL(1, 0) /* ID of this port */
--
1.8.3.1
